81805375495010 has 8 divisors (see below), whose sum is σ = 147249675891036. Its totient is φ = 32722150198000.

The previous prime is 81805375494949. The next prime is 81805375495031. The reversal of 81805375495010 is 1059457350818.

It can be written as a sum of positive squares in 2 ways, for example, as 80543929789129 + 1261445705881 = 8974627^2 + 1123141^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4090268774741 + ... + 4090268774760.

Almost surely, 2^{81805375495010} is an apocalyptic number.

81805375495010 is a deficient number, since it is larger than the sum of its proper divisors (65444300396026).

81805375495010 is a wasteful number, since it uses less digits than its factorization.

81805375495010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8180537549508.

The product of its (nonzero) digits is 6048000, while the sum is 56.

The spelling of 81805375495010 in words is "eighty-one trillion, eight hundred five billion, three hundred seventy-five million, four hundred ninety-five thousand, ten".